What is Sumatra PDF?
Sumatra PDF is a free PDF, XPS, DjVu, CBZ and CBR reader for Windows.
Sumatra PDF is small and starts up very fast.
Simplicity of the user interface has a high priority.
Portable version included (a single executable that can be run e.g. from USB drive and doesn’t write to registry).
Sumatra PDF 3.2 changelog:
upgraded core PDF parsing rendering to latest version of mupdf. Faster, less bugs.
support for multiple windows
improved management of favorites
dropped support for Windows XP. Use 3.1.2 on XP.